A yarn tensioning mechanism and a flat knitting machine having the same

Abstract

The present invention belongs to the technical field of knitting machines, and discloses a yarn tensioning mechanism and a knitting machine equipped with the mechanism. Compared with ordinary tensioning structures, a moving block is arranged in a positioning sleeve at one end of the compression spring away from the sliding rod, and the moving block can compress the compression spring in the direction of the sliding rod as the sliding rod slides in the direction of the tensioning wheel. When the sliding rod slides in the direction away from the compression spring, the moving block can move in the direction of the tensioning wheel as the sliding rod, thereby reducing or eliminating the problem of the spring force becoming smaller due to the movement of the sliding rod; at the same time, the next time the yarn becomes loose, the sliding rod can push the tensioning wheel more sensitively to tension the yarn. Moreover, compared with the prior art, because the movement of the moving block can make the compression spring always keep storing force or prolong the time of storing force, the tensioning distance controlled by the yarn tensioning mechanism can also be lengthened, thereby making the tensioning effect of the present invention better than that of the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of flat knitting machines, and in particular relates to a yarn tensioning mechanism and a flat knitting machine equipped with the mechanism. Background Art

[0002] A knitting machine is a weft knitting machine that uses a double needle plate latch needle. During the knitting process of the fabric, the yarn is knitted by reciprocating motion. Many knitting needles form knitted fabrics through interconnected coils. Its working principle mainly depends on the movement of the cam device and the knitting needles. The cam device is similar to a set of flat cams, and the needle pins can enter the grooves of the cams. The movement of the cam device will cause the knitting needles to move up and down regularly in the needle grooves of the needle plate, and the yarn is knitted into knitted fabrics through the action of the needle hook and the needle latch. The looping process can be divided into eight stages: unlooping, yarn padding, yarn carrying, closing, looping, looping, looping, looping and pulling.

[0003] During the operation of existing knitting machines, the yarn sometimes becomes loose. If it is not adjusted in time, it may cause uneven weaving, thus affecting the weaving quality. Generally speaking, the prior art is to slide a tensioning wheel on the knitting machine, and the yarn used for weaving passes through the tensioning wheel, and then pressure is applied to the tensioning wheel through a spring. When the yarn becomes loose, the elastic force of the spring will produce a compression effect on the tensioning wheel, causing it to slide on the knitting machine, thereby re-tensioning the yarn and solving the relaxation problem. However, in this tensioning structure, during the sliding of the tensioning wheel, the elasticity of the spring will gradually weaken or even disappear, resulting in a limited tensioning effect. Once the spring loses its elasticity, it becomes more difficult to re-tension the yarn. Therefore, it is necessary to further improve the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a yarn tensioning mechanism and a knitting machine equipped with the mechanism, so as to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, the present invention provides a yarn tensioning mechanism for tensioning the yarn by driving the tensioning wheel to slide on the computer flat knitting machine, comprising a positioning sleeve installed on the computer flat knitting machine, one end of the positioning sleeve is slidably connected to a sliding rod, and the extending direction of the sliding rod coincides with the sliding direction of the tensioning wheel on the computer flat knitting machine; the end of the sliding rod close to the tensioning wheel is connected to a limited abutment groove, and two abutment bearings are installed in the limited abutment groove, the two abutment bearings are symmetrically distributed relative to the straight line where the sliding rod is located, and the outer rings of the two abutment bearings extend to the outside of the limited abutment groove and abut against the tensioning wheel; a compression spring for pushing the sliding rod toward the tensioning wheel is installed in the positioning sleeve at the other end of the sliding rod; a moving block is arranged in the positioning sleeve at the end of the compression spring away from the sliding rod, and the moving block can compress the compression spring in the direction of the sliding rod as the sliding rod slides in the direction of the tensioning wheel.

[0007] As a preferred technical solution in the present invention, the other end of the positioning sleeve is rotatably connected to the first gear, the first gear is transmission-connected to the sliding rod and can rotate with the sliding of the sliding rod; the moving block is movably connected in the positioning sleeve, and the end of the moving block away from the compression spring is connected to a screw, the screw passes through the other end of the positioning sleeve and is threadedly connected to the center hole of the first gear; a circular hole is opened at the other end of the positioning sleeve, the screw coaxially passes through the circular hole, and the diameter of the screw is smaller than the inner diameter of the circular hole.

[0008] As a preferred technical solution in the present invention, the first gear is a bevel gear, the first gear is meshed with the second gear which is also a bevel gear, the second gear is coaxially connected with the third gear, the third gear is meshed with a rack, the extension direction of the rack is parallel to the extension direction of the positioning sleeve, and the end of the rack close to the tensioning wheel is connected to the sliding rod.

[0009] As a preferred technical solution in the present invention, a bearing seat is installed on the computer flat knitting machine, and the central axes of the third gear and the second gear are rotatably connected to the computer flat knitting machine through the bearing seat.

[0010] As a preferred technical solution in the present invention, a long hole is opened on one side of the positioning sleeve, and a connecting rod is slidably connected in the long hole, and the connecting rod is connected to one end of the sliding rod and the rack.

[0011] As a preferred technical solution in the present invention, the first gear is rotatably connected to the other end of the positioning sleeve through the first bearing, the inner ring of the first bearing is fixedly connected to the positioning sleeve, and the outer ring of the first bearing is fixedly connected to the first gear; the screw coaxially passes through the inner ring of the first bearing.

[0012] As a preferred technical solution in the present invention, the moving block includes a first moving block and a second moving block, one end of the second moving block abuts against the compression spring, the first moving block is rotatably connected to the other end of the second moving block through a second bearing, and the first moving block is connected to the screw.

[0013] As a preferred technical solution in the present invention, a central axis is provided at one end of the first movable block, and the inner ring of the second bearing is connected to the central axis; the second movable block includes an annular left sleeve and an annular right sleeve which are detachably connected by connecting bolts, the annular left sleeve and the annular right sleeve are respectively sleeved on both sides of the outer ring of the second bearing, and the annular left sleeve and the annular right sleeve are respectively abutted against both sides of the outer ring of the second bearing, and the compression spring is abutted against the annular right sleeve.

[0014] As a preferred technical solution in the present invention, the central axis of the first movable block includes a first central axis and a second central axis connected in sequence, the second central axis is arranged close to the second movable block, and the diameter of the second central axis is smaller than the diameter of the first central axis, the inner ring of the second bearing is matched and sleeved outside the second central axis, and the end of the second central axis away from the first central axis is threadedly connected with a locking bolt, and the inner ring of the second bearing is respectively abutted against the first central axis and the nut of the locking bolt on both sides.

[0015] On the other hand, the present application also provides a knitting machine, comprising a yarn tensioning mechanism as described in any of the above items, wherein a long slide groove is provided on the knitting machine, and the central axis of the tensioning wheel is slidably connected in the long slide groove.

[0016] Beneficial effect: Compared with the ordinary tensioning structure, the present invention has a moving block in the positioning sleeve at one end of the compression spring away from the sliding rod, and the moving block can compress the compression spring in the direction of the sliding rod as the sliding rod slides in the direction of the tensioning wheel. When the sliding rod slides in the direction away from the compression spring, the moving block can move in the direction of the tensioning wheel along with the sliding rod, thereby reducing or eliminating the problem of the spring force becoming smaller due to the movement of the sliding rod, and the next time the yarn becomes loose, the sliding rod can push the tensioning wheel more sensitively to tension the yarn. Moreover, compared with the prior art, because the movement of the moving block can make the compression spring always keep storing force or the time of storing force (the time of effectively keeping storing force as the sliding rod continues to slide) becomes longer, the tensioning distance controlled by the yarn tensioning mechanism can also be lengthened, and the tensioning effect is better than that of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 Enlarged schematic diagram of part A.

[0019] In the figure: 1-tensioning wheel; 2-positioning sleeve; 3-slide rod; 4-limiting abutment groove; 5-abutment bearing; 6-compression spring; 7-moving block; 701-first moving block; 702-second moving block; 8-first gear; 9-screw rod; 10-second gear; 11-third gear; 12-rack; 13-bearing seat; 14-first bearing; 15-second bearing; 16-locking bolt. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0021] In practice, a computerized flat knitting machine is equipped with several guide wheels to guide the direction of the yarn. At the same time, in order to prevent the yarn from loosening, a tensioning wheel is also installed on the computerized flat knitting machine, so that the tensioning wheel is slidably connected to the computerized flat knitting machine, and then a thrust is given to the tensioning wheel by a yarn tensioning mechanism. As long as the tensioning wheel is loose, the yarn tensioning mechanism will push the tensioning wheel to slide on the computerized flat knitting machine, thereby tensioning the yarn. The present invention improves the yarn tensioning mechanism to further enhance the tensioning effect.

[0022] Example:

[0023] like Figure 1 and Figure 2 As shown, this embodiment provides a yarn tensioning mechanism for tensioning the yarn by driving the tensioning wheel 1 to slide on the computer flat knitting machine, including a positioning sleeve 2 installed on the computer flat knitting machine, one end of the positioning sleeve 2 is slidably connected to a slide rod 3, and the extension direction of the slide rod 3 coincides with the sliding direction of the tensioning wheel 1 on the computer flat knitting machine, that is, the sliding direction of the slide rod 3 is consistent with the sliding direction of the tensioning wheel 1 on the computer flat knitting machine, so that the sliding of the slide rod 3 can be used to push the tensioning wheel 1 to slide on the computer flat knitting machine, thereby realizing the tensioning control of the yarn.

[0024] The end of the slide bar 3 close to the tensioning wheel 1 is connected to a limited abutment groove 4, and two abutment bearings 5 ​​are installed in the limited abutment groove 4. The two abutment bearings 5 ​​are symmetrically distributed relative to the straight line where the slide bar 3 is located, and the outer rings of the two abutment bearings 5 ​​extend to the outside of the limited abutment groove 4 and abut against the tensioning wheel 1, so that the slide bar 3 can drive the two abutment bearings 5 ​​to move when sliding, and then push the tensioning wheel 1 to slide on the computer flat knitting machine through the abutment bearings 5, and the two abutment bearings 5 ​​cooperate to give the tensioning wheel 1 a balanced force, so that the tensioning wheel 1 can stably slide along the slide groove on the computer flat knitting machine, thereby reducing or avoiding the friction between the tensioning wheel 1 and the computer flat knitting machine when sliding.

[0025] A compression spring 6 is installed in the positioning sleeve 2 at the other end of the slide rod 3 to push the slide rod 3 toward the tensioning wheel 1. The spring will automatically accumulate force when it is in a compressed state, thereby generating a spring force to give the slide rod 3 a thrust. As long as the yarn becomes loose, the compression spring 6 can push the slide rod 3 to slide along the positioning sleeve 2, thereby causing the slide rod 3 to push the tensioning wheel 1 to slide on the computer flat knitting machine, thereby achieving yarn tensioning control. The compression spring 6 is provided with a moving block 7 in the positioning sleeve 2 at the end of the compression spring 6 away from the slide bar 3. The moving block 7 can compress the compression spring 6 in the direction of the slide bar 3 as the slide bar 3 slides in the direction of the tensioning wheel 1. In practice, when the slide bar 3 slides in the direction away from the compression spring 6, the spring force generated by the compression spring 6 will become smaller. If the moving block 7 moves in the direction close to the tensioning wheel 1 together with the slide bar 3, the moving block 7 can further compress the compression spring 6, thereby reducing or eliminating the problem of reduced spring force caused by the movement of the slide bar 3. Therefore, the next time the yarn becomes loose, the slide bar 3 can push the tensioning wheel 1 more sensitively, and compared with the prior art, the tensioning distance controlled by the yarn tensioning mechanism can also be lengthened.

[0026] Compared with the ordinary tensioning structure, the present invention has a moving block 7 in the positioning sleeve 2 at the end of the compression spring 6 away from the slide rod 3, and the moving block 7 can compress the compression spring 6 in the direction of the slide rod 3 as the slide rod 3 slides in the direction of the tensioning wheel 1. When the slide rod 3 slides in the direction away from the compression spring 6, the moving block 7 can move along with the slide rod 3 in the direction of the tensioning wheel 1, thereby reducing or eliminating the problem of the spring force becoming smaller due to the movement of the slide rod 3. The next time the yarn becomes loose, the slide rod 3 can push the tensioning wheel 1 more sensitively to tension the yarn. Compared with the prior art, the movement of the moving block 7 can make the compression spring 6 always keep the force stored or the time of force storage (the time of effective force storage as the slide rod continues to slide) become longer, and the tensioning distance controlled by the yarn tensioning mechanism can also be lengthened, which has a better tensioning effect than the prior art.

[0027] As a preferred implementation scheme in this embodiment, it needs to be further explained that the other end of the positioning sleeve 2 is rotatably connected to the first gear 8, and the first gear 8 is located outside the positioning sleeve 2. The first gear 8 is transmission-connected to the slide rod 3 and can rotate with the sliding of the slide rod 3; the moving block 7 is movably connected to the positioning sleeve 2, and the end of the moving block 7 away from the compression spring 6 is connected to a screw 9, which passes through the other end of the positioning sleeve 2 and is threadedly connected to the center hole of the first gear 8; a circular hole is provided at the other end of the positioning sleeve 2, and the screw 9 coaxially passes through the circular hole, and the diameter of the screw 9 is smaller than the inner diameter of the circular hole. In practice, when the slide rod 3 slides, it will drive the first gear 8 to rotate, and the rotation of the first gear 8 will drive the screw 9 to move helically, and the screw 9 will drive the moving block 7 to move in the positioning sleeve 2, and then move toward the direction of the slide rod 3 and compress the compression spring 6. The structure is simple and stable.

[0028] As a preferred implementation scheme in this embodiment, it needs to be further explained that the first gear 8 is a bevel gear, the first gear 8 is meshed with the second gear 10 which is also a bevel gear, the second gear 10 is coaxially connected with a third gear 11, the third gear 11 is meshed with a rack 12, the extension direction of the rack 12 is parallel to the extension direction of the positioning sleeve 2, and the end of the rack 12 close to the tensioning wheel 1 is connected to the slide rod 3, such as Figure 1 and Figure 2 As shown, the slide rod 3 can drive the rack 12 to move when sliding, the movement of the rack 12 can drive the third gear 11 to rotate, the rotation of the third gear 11 can drive the second gear 10 to rotate, the rotation of the second gear 10 can drive the first gear 8 to rotate, the rotation of the first gear 8 drives the screw 9 to move, the movement of the screw 9 drives the moving block 7 to move, and the structure is simple and stable.

[0029] As a preferred implementation scheme in this embodiment, it needs to be further explained that a bearing seat 13 is installed on the computer flat knitting machine, and the central axes of the third gear 11 and the second gear 10 are rotatably connected to the computer flat knitting machine through the bearing seat 13, thereby ensuring the stability of the third gear 11 and the second gear 10 during rotation, so that the slide rod 3 can stably drive the moving block 7 to move when sliding.

[0030] As a preferred implementation scheme in this embodiment, it needs to be further explained that a long hole is opened on one side of the positioning sleeve 2, and a connecting rod is slidably connected in the long hole. The connecting rod is connected to one end of the slide bar 3 and the rack 12, so that the sliding of the slide bar 3 can stably drive the rack 12 to move together, and the connecting rod is slidably connected in the long hole, which can further enhance the stability of the slide bar 3 and the rack 12 when sliding.

[0031] As a preferred implementation scheme in this embodiment, it needs to be further explained that the first gear 8 is rotatably connected to the other end of the positioning sleeve 2 through the first bearing 14, the inner ring of the first bearing 14 is fixedly connected to the positioning sleeve 2, and the outer ring of the first bearing 14 is fixedly connected to the first gear 8, thereby ensuring that the first gear 8 is stably rotatably connected to the other end of the positioning sleeve 2; the screw 9 coaxially passes through the inner ring of the first bearing 14, and does not affect the meshing of the screw 9 and the first gear 8.

[0032] As a preferred implementation scheme in this embodiment, it needs to be further explained that the moving block 7 includes a first moving block 701 and a second moving block 702, one end of the second moving block 702 is abutted against the compression spring 6, and the first moving block 701 is rotatably connected to the other end of the second moving block 702 through the second bearing 15. The first moving block 701 is connected to the screw rod 9, and when the screw rod 9 moves, it drives the first moving block 701 to move spirally, while the second moving block 702 abutting against the compression spring 6 can maintain a relative sliding action, thereby giving the compression spring 6 only a compression force, and will not drive the compression spring 6 to rotate, so that the force on the compression spring 6 is more stable, thereby ensuring the service life of the compression spring 6.

[0033] As a preferred implementation scheme in this embodiment, it needs to be further explained that a central axis is provided at one end of the first movable block 701, and the inner ring of the second bearing 15 is connected to the central axis; the second movable block 702 includes an annular left sleeve and an annular right sleeve which are detachably connected by connecting bolts, and the annular left sleeve and the annular right sleeve are respectively sleeved on both sides of the outer ring of the second bearing 15, thereby realizing the detachable connection of the second movable block 702, facilitating the replacement of the second movable block 702 according to actual conditions, and more accurately controlling the elastic force of the compression spring 6, and the annular left sleeve and the annular right sleeve are respectively abutted against both sides of the outer ring of the second bearing 15, thereby ensuring the flexibility of the second movable block 702, and the compression spring 6 is abutted against the annular right sleeve.

[0034] It should be noted that, preferably, the positioning sleeve can be composed of two parts, which can be connected by bolts after being assembled, thereby realizing the assembly and disassembly of the internal structure.

[0035] As a preferred implementation scheme in this embodiment, it needs to be further explained that the central axis of the first movable block 701 includes a first central axis and a second central axis connected in sequence, the second central axis is arranged close to the second movable block 702, and the diameter of the second central axis is smaller than the diameter of the first central axis, the inner ring of the second bearing 15 is matched and sleeved on the outside of the second central axis, and the end of the second central axis away from the first central axis is threadedly connected with a locking bolt 16, and the inner ring of the second bearing 15 is respectively abutted against the first central axis and the nut of the locking bolt 16 on both sides, so as to realize the detachable connection of the second bearing 15, thereby facilitating the assembly of the appropriate movable block 7 according to actual conditions.

[0036] On the other hand, the present invention also provides a knitting machine, including a yarn tensioning mechanism described in the above embodiment, wherein a long slide groove is provided on the knitting machine, and the center axis of the tensioning wheel 1 is slidably connected in the long slide groove to ensure the stability of the tensioning wheel 1 when sliding.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A yarn tensioning mechanism, used to tension the yarn by driving the tensioning wheel to slide on the computer flat knitting machine, characterized in that: It includes a positioning sleeve installed on a computer flat knitting machine, one end of the positioning sleeve is slidably connected to a sliding rod, and the extension direction of the sliding rod coincides with the sliding direction of the tensioning wheel on the computer flat knitting machine; the end of the sliding rod close to the tensioning wheel is connected to a limited abutment groove, and two abutment bearings are installed in the limited abutment groove, and the two abutment bearings are symmetrically distributed relative to the straight line where the sliding rod is located, and the outer rings of the two abutment bearings extend to the outside of the limited abutment groove and abut against the tensioning wheel; a compression spring for pushing the sliding rod toward the tensioning wheel is installed in the positioning sleeve at the other end of the sliding rod; a moving block is arranged in the positioning sleeve at one end of the compression spring away from the sliding rod, and the moving block can compress the compression spring in the direction of the sliding rod as the sliding rod slides in the direction of the tensioning wheel; the other end of the positioning sleeve is rotatably connected to a first gear The first gear is connected to the sliding rod for transmission and can rotate with the sliding of the sliding rod; the moving block is movably connected to the positioning sleeve, and the end of the moving block away from the compression spring is connected to a screw, and the screw passes through the other end of the positioning sleeve and is threadedly connected to the center hole of the first gear; a circular hole is provided at the other end of the positioning sleeve, and the screw coaxially passes through the circular hole, and the diameter of the screw is smaller than the inner diameter of the circular hole; the first gear is a bevel gear, the first gear is meshed with the second gear which is also a bevel gear, the second gear is coaxially connected to the third gear, the third gear is meshed with a rack, and the extension direction of the rack is parallel to the extension direction of the positioning sleeve, and a long hole is provided on one side of the positioning sleeve, and a connecting rod is slidably connected in the long hole, and the connecting rod is connected to one end of the sliding rod and the rack.

2. A yarn tensioning mechanism according to claim 1, characterized in that: A bearing seat is installed on the computer flat knitting machine, and the central axes of the third gear and the second gear are rotatably connected to the computer flat knitting machine through the bearing seat.

3. A yarn tensioning mechanism according to claim 1 or 2, characterized in that: The first gear is rotatably connected to the other end of the positioning sleeve through the first bearing, the inner ring of the first bearing is fixedly connected to the positioning sleeve, and the outer ring of the first bearing is fixedly connected to the first gear; the screw coaxially penetrates the inner ring of the first bearing.

4. A yarn tensioning mechanism according to claim 1 or 2, characterized in that: The moving block comprises a first moving block and a second moving block, one end of the second moving block abuts against the compression spring, the first moving block is rotatably connected to the other end of the second moving block through a second bearing, and the first moving block is connected to the screw rod.

5. A yarn tensioning mechanism according to claim 4, characterized in that: A central axis is provided at one end of the first movable block, and the inner ring of the second bearing is connected to the central axis; the second movable block includes an annular left sleeve and an annular right sleeve which are detachably connected by connecting bolts, the annular left sleeve and the annular right sleeve are respectively sleeved on both sides of the outer ring of the second bearing, and the annular left sleeve and the annular right sleeve are respectively abutted against both sides of the outer ring of the second bearing, and the compression spring is abutted against the annular right sleeve.

6. A yarn tensioning mechanism according to claim 5, characterized in that: The central axis of the first movable block includes a first central axis and a second central axis connected in sequence. The second central axis is arranged close to the second movable block, and the diameter of the second central axis is smaller than the diameter of the first central axis. The inner ring of the second bearing is matched and sleeved outside the second central axis. The end of the second central axis away from the first central axis is threadedly connected with a locking bolt, and the inner ring of the second bearing is respectively abutted against the first central axis and the nut of the locking bolt on both sides.

7. A flat knitting machine, characterized in that: A yarn tensioning mechanism comprising claim 1 or 2, wherein a long slide groove is provided on the knitting machine, and the central axis of the tensioning wheel is slidably connected in the long slide groove.

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